Summary of practical experience in html knowledge points_HTML/Xhtml_Web page production

1. The table label is table, tr is the row, td is the cell, cellspacing is the distance between cells, cellpadding is the inner margin, caption is the title of the table, colspan is the merged column, rowspan is and parallel, table tbody
are all default. If you add multiple tdody, you can solve the problem of page display.

2. Hyperlink email link mailto: abc@shouhu.com
3.Can be long-distanced
4.lable can set shortcut keys
5.ini is simple Configuration information description, xml is a complex information description

6. Regular expression is a rule specially used to operate strings
It is represented by some symbols to simplify string operations
Common The operations are
match: matches
find: pattern, and macther object
cut: split
replace: replaceAll
web crawler: read the source file through the network as well as io, and pass the rules Get the numbers that match the rules in the web page
The meaning of the group in the regular expression: encapsulate part of the rules for reuse. Direction reference group

7.html is a hypertext markup language. The html language is composed of tags. The data in html will be packaged in tags, because the packaged content can be modified by changing the attribute value in the tag. Data is operated on.
Determine the html code range.
In this scope, China can define two parts, one is the header and the other is the body.
Tag features: To encapsulate data, there are start tags and end tags, but there are also some identifiers It only has one function, so there is no need for an end tag. The specification requires that tags must end, so such tags end internally

8. Common tags .
Title tags

List tags:

Both
Upper-level items:

Lower-level items:

items Symbol tags:

is unsigned

is signed
Both list items have
1. wrapper
   Image tags:
   Table tags: It is composed of rows and rows of cells. There is a default tbody tag in the table
   The table formats the table.
   Hyperlink tag: Sina website target
   When clicked, the engine's corresponding parsing program
   will be launched to find the specified host.
   One of the functions of hyperlinks: positioning tag
   Form tag: This tag can interact with the server.
   There are 10 major types: text, password, file, checkbox, radio, hidden, button, submit, reset, image
   Image all has the submission function
   
   Drop-down menu:
   
   
   
   Text area: Form components usually need to define name and value attributes <br><br>9. Form components usually need to define name and value The value attribute is sent to the server. <br><br>10. The difference between get and post <br>get: will display the submitted data on the address bar <br>post: will not display the data on the address bar <br><br>get: The size of the data submitted will be limited by the address bar <br>post: large data can be submitted <br><br>get: not safe for sensitive information <br>post: safe for sensitive information<br><br> get: will encapsulate the submission information in the request line, that is, before the http message header <br>post: will encapsulate the submission information in the data line, that is, after the empty line after the http message header <br><br> Components that use forms do not have to define the form tag. The form tag is only used when data needs to be submitted to the server. <br><br>11.css cascading style sheet <br> separates the styles in the web page. Completely controlled by css<br>Enhanced style reusability and scalability<br>Format: selector<br>Four ways to combine CSS and html code<br>1. Each html tag uses a style Attributes <br>2. When there are multiple tags on the page with the same style, they can be reused <br>3. When there are tags on multiple pages with the same style, the style can also be individually encapsulated into a css by adding each Define <br> in each page 4. Link <br><br> in the head tag through html 12. Selector: <br>1. Tag Selector <br>2． Class Selector <br>3. id selector <br><br>priority id>class>label <br> extension selector <br>1 associated selector: actually style the label in the label <br>2 combined selector: <br>3 .Pseudo element selector: <br><br>13. The difference between div and span <br>Div: row-level area <br>Span: block-level area